本文实例为大家分享了Spring boot实现文件上传的具体代码,供大家参考,具体内容如下
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1. 创建一个Maven的web工程,然后配置pom.xml文件,增加依赖:
org.springframework.boot spring-boot-starter-web 1.0.2.RELEASE
2. 在webapp目录下的index.jsp文件中输入一个表单:
这个表单就是我们模拟的上传页面
3. 编写处理这个表单的Controller:
import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; @Controller public class FileUploadController { @RequestMapping(value="/upload", method=RequestMethod.GET) public @ResponseBody String provideUploadInfo() { return "You can upload a file by posting to this same URL."; } @RequestMapping(value="/upload", method=RequestMethod.POST) public @ResponseBody String handleFileUpload(@RequestParam("name") String name, @RequestParam("file") MultipartFile file){ if (!file.isEmpty()) { try { byte[] bytes = file.getBytes(); BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name + "-uploaded"))); stream.write(bytes); stream.close(); return "You successfully uploaded " + name + " into " + name + "-uploaded !"; } catch (Exception e) { return "You failed to upload " + name + " => " + e.getMessage(); } } else { return "You failed to upload " + name + " because the file was empty."; } } }
4. 然后我们对上传的文件做一些限制,同时编写main方法来启动这个web :
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.context.embedded.MultiPartConfigFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import javax.servlet.MultipartConfigElement; @Configuration @ComponentScan @EnableAutoConfiguration public class Application { @Bean public MultipartConfigElement multipartConfigElement() { MultiPartConfigFactory factory = new MultiPartConfigFactory(); factory.setMaxFileSize("128KB"); factory.setMaxRequestSize("128KB"); return factory.createMultipartConfig(); } public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
5. 然后访问http://localhost:8080/upload就可以看到页面了。
上面的例子是实现的是单个文件上传的功能,假定我们现在要实现文件批量上传的功能的话,我们只需要简单的修改一下上面的代码就行,考虑到篇幅的问题,下面只是贴出和上面不同的代码,没有贴出的说明和上面一样。:
1.新增batchUpload.jsp文件
2. 新增BatchFileUploadController.java文件:
import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import javax.servlet.http.HttpServletRequest; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.util.List; /** * Created by wenchao.ren on 2014/4/26. */ @Controller public class BatchFileUploadController { @RequestMapping(value="/batch/upload", method= RequestMethod.POST) public @ResponseBody String handleFileUpload(HttpServletRequest request){ Listfiles = ((MultipartHttpServletRequest)request).getFiles("file"); for (int i =0; i< files.size(); ++i) { MultipartFile file = files.get(i); String name = file.getName(); if (!file.isEmpty()) { try { byte[] bytes = file.getBytes(); BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name + i))); stream.write(bytes); stream.close(); } catch (Exception e) { return "You failed to upload " + name + " => " + e.getMessage(); } } else { return "You failed to upload " + name + " because the file was empty."; } } return "upload successful"; } }
这样一个简单的批量上传文件的功能就ok了,是不是很简单啊。
注意:上面的代码只是为了演示而已,所以编码风格上采取了随性的方式,不建议大家模仿。
参考资料:MultipartResolver实现文件上传功能
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
1. MultipartResolver也可以实现文件上传功能。参考文章: